Brake drum



De- 4 1934 l T. v. BUCKWALTER 1,982,900

BRAKE DRUM Filed Jan. 5, 1934 f// Hrromvfrs.

Patented Dec. 4, 1934 UNITED Asfla'r'fas "PAjTjEFT ol-"Fica 41:98am) Ymm Tracy "V. JBuckwalter, Canton, 4Ohio, rassgnnto Y `The Tim'ken'Roller Bearing Company, (Brunton, l"()hiewa corporation of (Dho 'l i fnmicauunoanmys, 19st, saisine. 705.341 nia-olaims. (c1. 18842185 TMySinvention nrelates to brakeddrums yand has ier its principal obj ect-s'toproduce a lbrake Idrum of great strength for itsWeig-ht, to assuretrue roun'dness of the rim member and -concentricity y5 thereof with thehub of the-wheel and vvto lprovi'lle for 4facility and economy ofmanufacture and foi assembly 4with the Wheel. IThe invention consistsprincipally :in Iproviding vtheback withaniannular seat for the end of@the rim and extending-the back 1'0 beyond v`and around the end lof saidrim to' mechanically grip and 'laold the -rim. It also -con sists iinymaking lthe back member fof fthe 'brake drum outof circularmetal-plates I'ord'isks whose outer portions y-are Welded 'together and`vwhose linner vmargins 'are spaced apart l-by an interposed ring 'towhich 'they Lare `welded. YIt 5ateo consists in Imounting the inner end-of ithe" rim -on ithe periphery Aof 'the inner -dis'k with1the-marginal portion of the outer disk extending beyond and spun Aoverand against the outer surface lof said inner en'dof fthe rim member.It'ailsolconsists in the arrangements and combinations lvof pari-tshereinafter 'described and claimed; Q

En `the accompanying drawing, ivvlfrerein like reference numerals referto Elike parts Wherever theyfoccur,

Fig. -1 i's a longitudinal sectional view vof my brake Idrum mounted ona Wheel, #the plane loi. section-being iind'icate'd'by th'eline "J1-lofFig. 2, l

Fig. 2 is va cross-'sectionof mybrakedrum Aon theiline 2`2of 1,

Fig. 3 is a lfragrnentalsectional'view-'olf the Lbaril: member in -aplane'extending through the slots of a bolt hole, l

Fig.-4 Ais-a side -v-iew of allocking bolt,

Fig. 5 is an end view thereof looking toward its tip; and l Fig. 6 is adetail view of a modication wherein Ythe back member consists of asingle plate.

My present brake drum comprises a circular rim 1 of suitable metal witha cylindrical inner surface and with its outer surface provided with aseries of annular ribs 2. One end of this rim is mounted on a backmember 3. The back member shown in Fig. 1 comprises two concentriccircular disks or plates of metal. The inner disk 4 has a central holeadapted to admit or t over the hub 5 of a wheel and has its outerperiphery concentric with said central opening and of proper diameterfor the rim to t over. The second or outer disk 6 of the back member iswider than the inner disk and has a central opening adapted to admit ort over the hub of the wheel and its outer margin extends considerablybeyond 5i the outer edge of the inner disk just mentioned.

Theiinner quart ffof this extending margin `of `.the outer `disk abatsagainst the end iof 'the .rim and thevoutermost part vi8 of said7xnarg-inis spun bac'k tight-around the endmos't rib 2fof said/rim.

`Interposed between 5the inner and outer .disks 60 of the 'back memberis a wide :thick metal rein forcing and 'spacing ring '-9 with a central:eye `of the vsize `-to 'admit erin-over hu'bof @the Wheel.

The "outer portions -ofwtlie `inner and outer edisks areweided'together, zpreferxaibly by `spot-welding, 65. as indicated at150, and-the innerpor-tions fo'f Asaid disks `together with "itheinterposed ring are :like-- wise-welded together as at 1'1. Ih-us, theIouterportion effthe back Lmember :comprises twoitl'iicknesses oImetalintegrated by '-welding, 70 while the central portion comprisesthree/thicknesses of metal integrated by welding.

`i-*Ihe 1back member 'fis' lmounted fon the hub of the Wheelfwi'th :itsouter 'd-isk f6 seated atwise against a wide 'annular 'flange 1f2 onrsaid T'hii'b, 75 said 'flange gpreerably being #of Isame 'Width as thereinforcing fand spacing `rring of the back plate. Said back lmembezrand said liiange yfare secured together by iflatfhea'd irivets i3 whichextend fthrough vholes 1in 'the reinforced 8D portion of the `rimmember. The irivetheadslare located in counter-bores provided Atherefor4in the outer -face fof said flange and the innerlends .0I the rivets`are 'upset againstthe vinner idisk. The reinforced `por-tion of the'back member is zpro- 8 5 vided with a second circular series:ofholesfadapted '5to `receive llocking boi-ts 14 that f detachablyclamp fthe mainpor-tion of the :wheelthereto iDine inner ends o i "tliebolt holes Larercountersunk, preferablyl somewhat `more ithan fthethickness of 9p the inner disk, to receive the countersunk heads of thebolts. 'I'he inner ends of the bolt holes have outwardly extending slotsadapted to receive lugs 15 which are provided therefor on the bolts..Sii

The bolt holes extend outwardly through the ange of the hub and areflared or countersunk to receive the raised annular margins of the boltholes in the securing flange of the wheel. The outer ends of the boltsare screwthreaded and m0 provided with clamping nuts 16 which havetapered shoulders. The bolts are entered into the bolt holes from theinner side of the back member and positioned with their lugs in theslots provided therefor in kthe back member. The m5 wheel flange is thenmounted over said bolts and the nuts mounted on said bolts andtightened, whereby the wheel is securely but detachably mounted inplace.

The advantages of the foregoing construction 1m) are the following: Theparts are very simple and easy to make and to assemble. The mounting rimon the periphery of the inner circular disk insures true roundness ofthe rim and its concentricity with the disk and consequently of the hubof the wheel. The use of two relatively thin disks together with theirouter vportions Welded directly together and with their inner portionswelded to the reinforcing and spacing ring produces a very strongstructure which is very well suited for riveting to the ange of thewheel hub and for receiving the holding bolts that detachably secure thewheel. The spinning of the margin of the outer diskover the end of thebrake rim member is peculiarly advantageous,

especially in cooperation with the support of said ring by the innerdisk, because it is `effected by a simple operation and produces a tightjoint without resort to extraneous fastening devices. .i

In the construction hereinbefore described, the back member is made oftwo disks of sheet metal with an interposed reinforcing ring, all weldedtogether. In the modification illustrated in Fig. 6, the back memberismade of a single plate 'or thickness 21 of sheet metal. In thismodiiication, a circular groove 22 is formed inthe outer portion of theplate and the inner wall 23 of the groove is made cylindrical and ofproper size to iit tight in the end of theprim. The bottom 24 of thegroove is radially disposed and serves as an abutment for the lend ofsaid rim; and the outermost peripheral portion25 of the plate is spunback around the endmost rib 2 of the rim so as to tightly grip the same.Thus, the rim is firmly clamped on the seat provided therefor by thegroove.

What I claim is: yg l r 1. A brake drum comprising a back having anannular groove and a rim having one end tightly tted in said groove saidback comprising-.acircular plate whose periphery forms the inner wall ofsaid groove and a second circular plate of larger diameter than saidiirst mentionedplate with its marginal portion of angular shape andforming the bottom and outer side of said groove.

2. A brake drum comprising a back and a rim mounted thereon, said .back`having a circular plate whose periphery forms aseat for the rim and asecondk plate concentric therewith with its marginal portion extendingbeyond said seat and enclosing the end of said rim. n 3. A brake drumcomprising a back and a rim mounted thereon, said back having a circularplate whoseiperiphery forms a seat for lthe rim anda second plateconcentric therewith with its marginal portion extending beyond said rimand spun over the end of said rim.

4. A brake drum comprising a back and a rim mounted thereon and providedwith an exterior rib at the end thereof, said back having a circularseat fitting in the end of the rim and a marginal portion extendingbeyond said seat and tightly gripping the rib at the end of said rim.

5. A brake drum comprising a back member and a rim member mountedthereon, said rim member having exterior annular ribs, and said backmember comprising a circular inner disk and an outer disk of greaterdiameter than the inner disk and with its marginal portion spun over theend of said rim member.

6. A brake drum comprising a back member and a rim member mountedthereon, said rim memberhaving exterior annular ribs, and said backmember comprising a circular inner disk and an outer disk weldedtogether, the outer disk being of greater diameter than the inner diskand having its marginal portion spun over the end rib of said rimmember.

7. A brake drum comprising a back member and a rim member mountedthereon, said back member comprising a circular inner disk tightlyiitted in one end of said rim, an outer disk of greater diameter thanthe inner disk and with its marginal portion spun over said end of therim and a wide spacing ring interposed between the central portions ofsaid disks, saidv disks being welded together and to said interposedring.

8. A brake drum comprising a backv member and alrim member mountedthereon, said rim memberhaving exterior annular ribs, said back membercomprising a circular innerl disk tightly ttedin one end ofl said rim,an outer disk of greater diameter than the inner disk and with itsmarginal portion spun over said end of the rim and a wide spacing ringinterposed between the central portionsof said disks, said disks beingwelded together and-to said interposed ring.

9. A brake drum comprising a back member and a rim member mountedthereon, said rim member having exterior annular ribs, said back membercomprising a circular inner disk tightly fitted inan end ofsaidrim, anouter disk of greater diameter than the inner disk and with its marginalportion spun over said end of the'rim and a wide ring interposedbetweenthe central portions of said disks, said disks being welded together andto said interposed ring, fand said back member havingv holes extendingthrough said ring to receive fastening devices.

TRACY V. BUCKWALTER.

